package report

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strings"
	"time"
)

// PullInfraBackup fetches the infrastructure backup from the Hub.
// Returns nil, nil if no backup exists for this customer.
func PullInfraBackup(hubURL, apiKey, customerID string) (*InfraBackup, error) {
	url := strings.TrimRight(hubURL, "/") + "/api/v1/infra-backup/" + customerID

	client := &http.Client{Timeout: 30 * time.Second}

	req, err := http.NewRequest(http.MethodGet, url, nil)
	if err != nil {
		return nil, err
	}
	if apiKey != "" {
		req.Header.Set("Authorization", "Bearer "+apiKey)
	}

	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("hub request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusNotFound {
		return nil, nil // no backup for this customer
	}
	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("hub returned HTTP %d", resp.StatusCode)
	}

	body, err := io.ReadAll(io.LimitReader(resp.Body, 5<<20)) // 5MB limit
	if err != nil {
		return nil, fmt.Errorf("reading response: %w", err)
	}

	var ib InfraBackup
	if err := json.Unmarshal(body, &ib); err != nil {
		return nil, fmt.Errorf("parsing infra backup: %w", err)
	}

	return &ib, nil
}